In case your Software Update hasn’t notified you already, there’s a Security Update waiting for your attention. It addresses a pretty long list of security concerns within OS X.
If you’d like to go and install it now – not a bad idea – then go up to the Apple menu and select Software Update. The security update will require a reboot, so be prepared for that.
The 2007-004 Security Update clocks in at just under 17mb and covers:
AFP Client
AirPort
CarbonCore
diskdev_cmds
fetchmail
ftpd
gnutar
Help Viewer
HID Family
Installer
Kerberos
Libinfo
Login Window
network_cmds
SMB
System Configuration
URLMount
Video Conference
WebDAV.
For more information you can check out the Apple docs page.
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